Imagine John Lennon's childhood... Liverpool 1955: a smart and troubled fifteen year-old (Aaron Johnson) is hungry for experience. In a family full of secrets, two incredible women clash over John. Mimi (Kristin Scott Thomas), the buttoned-up Aunt who raised him, and Julia (Anne-Marie Duff), the prodigal mother. Yearning for a normal family, John escapes into the new and exciting world of rock n' roll where his fledgling genius finds a kindred spirit in the teenage Paul McCartney. Just as John begins his new life, tragedy strikes. But a resilient young man finds his voice—and an icon explodes into the world.